# Java: Add all the digits of a given positive integer until the result has a single digit

## Java Basic: Exercise-108 with Solution

Write a Java program to add all the digits of a given positive integer until the result has a single digit.

**Pictorial Presentation:**

**Sample Solution:**

**Java Code:**

```
import java.util.Scanner;
public class Example108 {
public static void main(String[] arg) {
// Create a Scanner object for user input
Scanner in = new Scanner(System.in);
// Prompt the user to input a positive integer
System.out.print("Input a positive integer: ");
// Read the user's input as an integer
int n = in.nextInt();
if (n > 0) {
// Check if n is a positive integer
System.out.print("The single digit number is: " + (n == 0 ? 0 : (n % 9 == 0 ? 9 : n % 9)));
}
// Close the input scanner
in.close();
System.out.println("\n");
}
}
```

Sample Output:

Input a positive integer: 25 The single digit number is: 7

**Flowchart: **

**Java Code Editor:**

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